std::raw_storage_iterator
Defined in header <memory> | ? | ? |
|---|---|---|
template< class OutputIt, class T > class raw_storage_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void>; | ? | (until C++17) |
template< class OutputIt, class T > class raw_storage_iterator; | ? | (since C++17) (deprecated) |
输出迭代器std::raw_storage_iterator使标准算法能够将结果存储在未初始化的内存中。每当算法写入类型的对象时T对于取消引用的迭代器，对象被复制到迭代器所指向的未初始化存储中的位置。模板参数OutputIt是否符合OutputIterator而且有operator*定义为返回对象，其中operator&返回类型为T*.通常，类型T*被用作OutputIt...
类型要求
-输出必须符合输出器的要求。
*。
成员函数
(constructor) | creates a new raw_storage_iterator (public member function) |
|---|---|
operator= | constructs an object at the pointed-to location in the buffer (public member function) |
operator* | dereferences the iterator (public member function) |
operator++operator++(int) | advances the iterator (public member function) |
base (since C++17) | provides access to the wrapped iterator (public member function) |
成员类型
Member type | Definition |
|---|---|
value_type | void |
difference_type | void |
pointer | void |
reference | void |
iterator_category | std::output_iterator_tag |
注意：在C++17之前，这些成员类型必须通过从std::iterator<std::output_iterator_tag,void,void,void,void>...
例
二次
#include <iostream>
#include <string>
#include <memory>
#include <algorithm>
int main()
{
const std::string s[] = {"This", "is", "a", "test", "."};
std::string* p = std::get_temporary_buffer<std::string>(5).first;
std::copy(std::begin(s), std::end(s),
std::raw_storage_iterator<std::string*, std::string>(p));
for(std::string* i = p; i!=p+5; ++i) {
std::cout << *i << '\n';
i->~basic_string<char>();
}
std::return_temporary_buffer(p);
}二次
产出：
二次
This
is
a
test
.二次
另见
allocator_traits (C++11) | provides information about allocator types (class template) |
|---|---|
scoped_allocator_adaptor (C++11) | implements multi-level allocator for multi-level containers (class template) |
uses_allocator (C++11) | checks if the specified type supports uses-allocator construction (class template) |
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